904 or 727

I was looking for weight specs on my wagon and if I was reading right on wikipedia it states it should be around 2700-2800lbs. I think it will be a fun little street pounder with 400-450 horse. I am going to keep the 904 and been thinking about 390 stroker kit for my 318 with eddy magnum heads with the 58cc combustion chamber. I can decide if I should rebuild myself or purchase a complete trans. 3000-3500 rpm stall converter.