Thank you for the ideas. Yes, I may be overthinking it. This is for a Holley Sniper EFI system. It certainly sounds easier to add a port to the side pipes than to modify the headers. I’ll just have to be patient since fitting side pipes with body installed is a ways off.

I am building a street FE engine for a Cobra.  My Cobra kit came with SS long tube headers and I need to find a way to put an oxygen sensor on one side.  I've found some pieces meant for this and a shop that could probably do it.  My question is about how the engine would react to having this merge collector only on one side.  I'd prefer not to modify both.  The exhaust flow pattern would be different on each side but maybe not enough to notice?

Would there be a down side to using the tilter device with 2 chains instead of 4, attached to opposite corners on the heads?  Then having the ability to adjust the angle as it’s lowered?

A picture of your setup would be helpful.  This is maybe a minor point but it's hard to know what's important when it's your first time doing it.  Anyway, my intake bolts are ARP and it said to follow the intake manifold manufacturer guidance for torque.  Mine is Edelbrock and I think it said 25 ft-lb which seemed low but that's what I did.  I also put RTV on the washers to prevent oil seepage.  So if I undo the four corners, should I retorque all the intake bolts?  And clean and reapply the RTV to all the washers?

I am having some issues getting my valve cover mounting holes aligned.  I had trouble getting my Edelbrock intake aligned a while back and the advice I got on the forum to use thicker intake gaskets did the trick.  I should have expected some issues with valve cover holes.  I have Ansen short style aluminum valve covers and am planning to use studs.  When the covers didn't fit on the studs, I opened up the holes in the covers from 11/32" to 3/8", using a drill press and just holding the cover by hand.  It helped, but not enough.  Right now, I have the top 3 studs in place and you can see from the below picture what one of the bottom ones looks like.  I could maybe try going to 7/16" on all of them.  I don't think I could drill off center very well using my drill press.  Any advice?

Thanks for all the ideas guys

Has anyone used an electric prelube pump or have any advice on where to find one and where to hook it up?  The car I’m building will sometimes sit for long periods. I would consider using an accumulator but the engine bay is tight. It might be easier to find room for a pump.  I’m using a Aviaid Cobra oil pan and less concerned about needing an accumulator while driving. Just want to be able to prelube.

Thanks Brent. I’m going to give it a try.