[TTurbo565]

I can't make the standard "kit" parts fit that combo. You get close with 454 pistons on a 4.25 stroke with 6.535(wrong 6.385) rod, but the piston ends up .040 down in the hole. you could deck the block .020 and run .020 thick head gaskets. 13:1 pistons are a dime a dozen for 454. The Scat or Eagle kits are pretty good. this is the cheapest way, and checks all of your boxes for the bottom end. Add the cost of custom pistons on top, and you are covering the cost difference between the 10.2 inch deck and the 9.8 inch blocks. Used 10.2 inch block intake manifolds are pretty available. The key to what power you make will be in the heads. aluminum heads are nice, but they are expensive. A set of properly prepped 781 heads will get you the flat torque curve you are looking for. Spend your money on one of Straubs custom cams and a set of Crower sportsman rockers and you will have a combo that will run for years.

scratch those numbers. I need to use the proper calculator for pin height.

you will need 6.385 rods with decking the block .020.