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custom fab is needed,and lots of money i threw 10k into a carby engine and got 210 rwhp better tune would have seen maybe 240,most use the std barra turbo with good results,use std oil pump,no one makes large valves so ya have to turn down 2v clevo intakes and use chev 1.6 exhaust,you can throw 3k easy at a crossflow head to make that kind of power you are talking about,yes either ef crank or std 250 crank,another thing to consider is 3 or 4 bolt balancer ,i would start with a 84da block it has 1 piece rear main seal and larger flywheel bolts.