How about just use the 383 with a good balance job

Put these pistons in it:

http://www.summitracing.com/parts/SLP-WL2315F30/

Fresh 906s with good valves and springs (little extra coin from them):

http://www.aeroheadracing.com/id6.html

Hughes whiplash cam:

http://www.hughesengines.com/Index/produ...mp;partid=25115

And this with just 100HP jets:

http://www.dynotunenitrous.com/store/scripts/prodView.asp?idproduct=192

Should make 450hp

I know I love the sound of this cam at idle and it is supposed to be ground to cater to low compression.

Ill let you know how this works because it is the EXACT combo that I am going to run unless PROBE makes there new pistons with the 5/64 rings and two valve reliefs (supposed to be ligther) for a 4.280 bore and 3.375 stroke with stock rod length