What type of bearings to use?

[cobrashoch]

Lynn - I've used various Clevite bearings with soft cast cranks, with fair to good success.
But in your case, with a forged crank, I suggest I suggest that you use exactly what the factory uses with forged cranks. I.E. - factory bearings. Just make sure you order bearings from a factory forged crank type engine. I'm also assuming you have the stock replacement type H-beam rods. Are you building that engine yourself?
Clearancing the bottom end of a engine is a time consuming art in itself, that requires a machine shop. For a stock type clearance job though, you can "cheat" by setting your rod side clearances to the minium number by using over and under bearings in the mockup. It will take time to work this out because you will have to keep ordering plus or negitive size rod bearings.
I would also use the rod bolts on those rods for the mock up work, but for sure I ditch them for the better ARP bolts for the final assembly for several reasons, most notably you've streched them out during mockup work.
If you are using a pro engine builder I for sure would trust his assembly expierience anytime over using the latest "trick" stiff out there. It's MUCH MORE important to have your engine stay glued together than to have the latest and the greatest stuff.
As for engine coatings, they work. But they tend to to be short lived dependent on where you use them. If your the type that tears a engine down for inspectons from time to time, as I am, then coatings help. If your into long term engine use without teardowns I would not use them. Because as coatings wear out the engines clearances become loose and sloppy, depends on where they are used.
I also like the idea your using on a GT40 of using electronic fuel injection. When it comes time to fire that guy up, I also have some novel ideas on how to get air out of your cooling system. And that WILL be a problem. Good luck.
cobrashock