[sleepydsm]

My refreshed stock 6 bolt by me has been making 400+ whp for over a year now.

Stock head (+cams), headgasket, shortblock
Arp regular headstuds, ACL race bearings
Stock rings, stock bore, oil squirters, no balance shafts

I would really suggest a turned down balance shaft instead. I hate the increased oil pressure that comes from eliminating them.

I say:

stock 6bolt swap
E85
Injectors over 1000cc
Single Walbro 255hp
ACT 2600 clutch and flywheel
*I've used both the fidanza and the ACT flywheels. I think the ACT is a more appropriate weight
*The ACT clutches are proven on DSMs. Get a sprung 6 puck disk, though
FP exhaust manifold
Don't really need an intake manifold, but it helps.
Cams. I have Brian Crower 272s (or get HKS) on stock springs and retainers. Works great.