im all set for my stroker but i was just wondering what some of your opinions would be on some of my questions. this will be on a 347 or 331 stroker. im leaning towards a 331. 1st off....heres what im looking for....Good Driveability, 375-400 RWHP, MAYBE some nitrous 100 shot at most..and rarely.....street drieven with occasional track use...probably only 5 times a season. -ok now would i be ok with a Cast Steel crank or should i go Forged?? -what is better/the major differences/what would suit my needs...H beam or I beam rods? -one set of rods says 5140 forged I beam and teh other 4340 forged H beam...im thinking teh 4340 is alot better -does a 1 piece billet steel main support sound good? -anyone ever hear of the brand KAT for internals? i dunno if it was just a mistype mean SCAT ....that was listed on a shortblock -not into far detail but would u guys go with 331/347...i dont think the tradeoffs are worth it for a 347...less life, chance of burning oil on startup, only an average 25 Hp differnce -and finally,this will be on a brand new Ford Block. With the block hold this motor even with the 100 shot of nitrous? assuming im making 400RWHP? and ive head sportsman hold up to 650..is this accurate? thanks in advance for any help.