Supercharged Smallblock Combination.

Well guys I will start this off by saying Hi!
I have been lurking throughout this forum for awhile and have been brewing the next motor combination for my 71 Plymouth Scamp.

The current motor is a 10:1 360 with the mopar performance .450 hyd. cam, stock "x" heads, edelbrock air gap intake, generic 1 5/8 headers, 2600stalled 727, 8 3/4 w/ 3.23 gears. It ran low 13's (avg. 13.20-.24 @ 105mph w/ avg. 1.87-.84 60's).

I kinda put it on the back burner for a turbo'd import. (don't bann me.) Which was fun and expensive. But after putting the 4th. motor in, in only 14k miles I decided to give up on that project. However I will never go back to N/a ever again. Which leads me to this... (Sorry for the long intro.)

I want to supercharge the Scamp. I have sent emails back and forth to Bob @ the supercharger store. We came up with a neat decently priced package including fuel system, methanol injection system, and needed supercharger stuff. The package is set-up for the future motor I want to build...

Plan for new motor (Serious amount of constructive criticism needed/wanted)

Mopar Performance R3 340 Race Block,
Forged 4" Stroker crank,
Eagle H-Beam rods,
Some sort of custom pistons for approx. 8:1 compression,
Edelbrock Al. heads, (340 ones or the other ones?)
Airgap Intake,
Ati D-1 procharger, (approx. 10-20psi depending on detonation resistance)
1 3/4 fenderwell headers (Do I need bigger?)
750 Demon blow-through carb.,
MSD ignition, (Do I need boost-retard, or should I lock out the dist.?)
Cam (?)


Do I need the R-3 block? The thick webs and 4-bolt mains are added ease of mind, but my goals are not to be breaking any speed records.
The R-3 block can be bored out to 4.22" I believe, but I'm wondering if the Eddy Heads are capable of supporting that much cu in.? Should I run a roller cam? Is it really worth the added cost?
Anybody know of a site in which you can find the specs. of pistons companies make to maybe match up a set that would work with my needs? (wishful thinking I know, but I am flexible with bore size if I get the R3 block)


Finally my goals are to go fast enough to need a roll cage without question. I would like to run 10's without breathing hard. Also I want to be streetable enough to not think twice about driving 400miles to the nearest big mopar show. I was told that I didn't need 448cu in and 18psi to do this (the estimated guess for hp was an easy 700-800 on pump gas lots more with better gas).

Do you guys think I should get the r-3 block or am I over thinking things as usual?

((Re-cap for people with A.D.D. - what do I need in a smallblock to run 10's with a supercharger and be dependable and streetable enough to not worry about it))

Thanks,
Brian