I was just about to pull the trigger.  Then I saw the cork valve cover gaskets.   

I do not follow many forums so it seemed prudent to ask.  As noted in the subject, I have a complete drivetrain (engine, transmission, rear axle) from a '66 galaxie.  I haven't gathered all casting numbers and such (it's cold outside right now), but to my knowledge they are all matching numbers wise.  I won't have a need for it but it seems like something that should be offered as a package for anyone looking for period correct or numbers matching drivetrain.  I am running with the assumption that the private classifieds on this forum would not have much interest in something like this.  If I am wrong in that assumption, please let me know.  If there are forums or other options better suited for making such an offering, please let me know.     Thank you in advance for any information.  I forgot to mention that the drivetrain consists of a 390 4bbl, 4 speed toploader and the 9" rear is 3.50 gears and has the vibration damper (whatever that was called) on the rear of the driveshaft.

No need for forgiveness.    For me, this thread is mostly about information gathering.  For example, prior to this thread, I was not aware that some 428 blocks cast in late '66/early '67 were cast with the bosses extra material in the web.

My 2 cents on the different block castings in relation to installing cross bolt caps in a nutshell.  While it isn't required (as you have noted) to have a block with the cross bolt bosses to install the caps and benefit from them, for whatever reason those blocks were cast with the bosses and extra material (crows feet) in the webs.  While not necessary by any means, it seems like a better base/foundation to start with if cross bolt caps are being added.  This, of course, assumes availability.  Sometimes you have no choice but to work with what is available.

Hello, just wondering if anyone has ever done a comparison on putting the larger CJ valves in a stock 390 GT head.

I have put larger valves in a set of c4 6090g heads with no other work.  Flow numbers before and after were in essence the same.

Also, this question would probably be better suited for the fe technical forum versus private classifieds forum.

Urgefor,

Do you need the C5 and/or the bosses for a specific reason?

Mostly to make my life a bit easier.  I have a '64 block with the bosses but the project car is a '66. I've fabricated some motor mounts to make it fit but it just "bugs" me a bit. Long story short, I was not aware some C5 blocks were cast like that also.  If I can get a C5 block with bosses and extra material in the webs like the '64 block along with the 4 bolt engine mount pattern, it would be a win/win for me.  I have a couple C6 engines.  To be more precise, one engine (from a country squire) along with a complete drivetrain from a '66 Galaxie that was a real man's car.  4bbl, 4spd, no air, no power brakes and no power steering.   

I'm running with the assumption that early model year blocks would have a better chance to be cast with the bosses.  What I don't know is what would be considered "early"?  September to January?  September to April?

Thank you for the information.  Unfortunately I don't see a path forward using your block that won't be lots and lots of extra $$ whether it is bore and get custom pistons or have it sleeved to fit the .030 over pistons I already have.