well you could just use a tbi or mass air tbi GM built them and they go 200.000+ can not get much better then that same with fuel pump delco is hard to beat . as for your 454 as for gen ? if its a two pc rear seal then its a mark 4 orIV same base block from 65 to about 90. one pc seal crank its 91 and up mark 5or V or 6. VI i would put a mark 6 454 or 496 in it base off the new block and use the intake and all gm computer hard ware.harness.box. this way it a hyd roller enigine and you have crank trigger buy a low mile wreck and swap all parts to yours