Well, going with a better matching header is good. I don't think you need a lot of primary pipe, but like Barry said just hit the mark close. I think I'd go 2 inch if doing all the work. I don't like those short collectors either, my 445 has them.
As far as the cam, if it's a hydraulic block, you could consider a nice hydraulic roller and just go a little bigger, but you really aren't that far off. Good breathing heads and intake and plenty of lift will let a cam hang in there a lot longer than if that cam was in an iron head/dual plane and your setup should like more or less what you have now.
I am not sure what your advertised numbers are but my hunch is the truck would be a little happier on fuel with the current cam straight up (108 ICL) and power would hang in there slightly longer. Could even run the lash on the tight side, but in the end it doesn't sound too bad to me and would save you money to just rock it back.
Thanks to all for the input!
I had a bone stock medium riser standard bore the only addition was the tunnel wedge and BT BU carbs.
I then sold the NOS BT BU carbs and bought a pair from Barry
Went with a Genesis Block
Barry's CNC'd Edelbrock Heads
4.25 x 4.25 Crank
Diamond Pistons etc
10.41 Comp
And Yeah I did a bit of port work on the NOS Tunnel Wedge Intake Thinking I would pick up worth while power
The cam was for the bone stock 427 so that is why I asked. If I were to change it, now would be the time as I have to pull the front clip to do the headers. (had to assemble so I could move it across country)
Advertised on cam is 288 ~ ~ 292 Lobe lift .340
Lobe Separation 106
It would have worked great probably in the stock bore stock heads 427
I am getting OLD so I wanted something I could just drop in gear and not worry about being too hard to drive.
Tight converter and a 3.50 gear
2" primary is what I ordered in case I want to get a bit more out of it.
I do not see myself going to far from home with this truck. Typical would be 20-25 miles one way tops. Just to a car show, scottsdale pavilions.
My long distance runner~daily driver will be the '66 with the TT 3.5L EcoBoost with a few luxuries.
This 427 truck I may make a few laps at GoodGuys event for giggles but that will be the extent of it.
Would love to drive it or haul it to Knotts show in Cali tho. Never been there but always wanted to go.
Initial plan was to take both trucks to SEMA . . .