So you use stock length rods? 454 or 427 pistons? When the piston is at TDC will it be at the deck's surface or a .250 below? I've always wondered how that works. I know that both blocks are 9.80 deck height. I'd actually like to know too what other combinations I could use, i.e. 4.5" bored block. I understand it would have to have the 2 piece seal. I have a nice 427 crank and other big block parts to do another build.