The only way you will really know for sure is to put it all together and take her to a dyno, really, its going to vary, wild guesstimate, anywhere from 50-80 or so, lol, too many variables, depends on how well the porting is done, how well the heads are done and what kind of cam grind is done. Does that help?
Well, I'm getting ~220 RWHP with a cam and boltons,
(no porting whatsoever!!!)
and a STREETABLE P&P with stock compression would
get it up to about 250 RWHP (projected max) without
spending tons of money. However, using advanced
build techniques, and raising compression, this could be
surpassed. 8) Might as well do a complete rebuild at
this level, and use an overbore and forged pistons/rods...