Help with building a bit more power in to the 318

Oh yes, i agree -the 904 will handle huge power when built properly. They are often favoured in drag racing over the 727 due to their lighter weight and reciprocating mass. I also am running a mild 904 behind a mild 360 (215 RWHP) in a heavy Challenger with no problems (although i don't abuse my cars)

i am just saying to Northernswede that it would not be advisable to put his stock 904 (which i assume has done some miles already) behind this 400HP 318 that he wants to build. Would you advise that? I don't think anybody would.

However if i had lots of of time and money on my hands it certainly would be interesting to put a new/rebuilt but completely stock 904 behind a well worked SB and see how much it could actually take.