Hemi against a 904

A stock 904 with XX,*** miles on it may not last very long. Has it been rebuilt ? How much power are you planning on making with the 5.7 ? Will you need to upgrade the 904 and if you do will it last long ?

Im not saying its a bad idea it just may end up cheaper using the beffier 727 in the long run. I plan on running a 904 behind my 500 horse 340 but my tranny has been very well built. Theres probably close to $2000 in the trans and converter.