Approximate Cost to Buld 375-400hp 360?

4,000 to 7,000 , at least that's what it cost me to get 400+hp out of a 340 , depends on how much you do yourself and the type parts used . Forged pistons and crank or cast , iron heads or alu , lots of variables . MRL 360 is a good deal for a 360 with all new parts , built right .