ATTN : Expert engine builders. Question.........

[speedzone]

I am rebuilding the 408 Cleveland stroker for my Pantera...........forged crank, rods, 4 bolt mains, 11.5:1 CR, CHI heads, and 252 duration @ .050 roller cam. Should be + - 600 HP. The pantera uses a different oil pan and extended pump pickup that requires a special windage tray. This also requires a "towered" style main bolt to mount the tray and pickup on 4 of the inner main bolt locations. I purchased a set of new main bolts from ARP, but in the other aformentioned holes I had to use the non ARP towered bolts (which are actually a common main bolt in Chevy truck big blocks). So basically I have mixed and matched and I'm using the towered bolts in the 4 needed locations and the rest are the ARP. The shop that did the machine work is performance oriented and very well known and respected in my area................and they have assured me that this will not be a problem, being that the thread and reach of all the bolts are the same. Well, now that I am getting closer to dropping the motor in, I am having nitemares of different clamping forces and a wasted crank and or bearings because of it. Can any of you experts chime in with your expertise or opinions?