So tell us about the discharge opening[Delta,square,other?]Will you change the design of the intake depending on the opening?

Clanton, since I don't have all those parts it's really hard to say. I think I would go with the standard opening and hopefully find a W2 tunnel ram I can make the intake out of. Might not work its been a long time since I had a tunnel ram in my hands. If I can find a good aluminum welder it shouldn't be too difficult. Since I don't really have a negative response as yet I'll plan on a 8-71 until I can verify it will not work. I'm also interested in what length snout people have used for the smallblock It seems like there's not a lot of info out there on the smallblock. If anyone has a setup that will pm me info I sure would appreciate it. Thanks, Max

Thanks for the reply,I just wanted to see what your ideas were.

How do you modifie the tunnelram for the blower?
I have a 6-71 and a Holley Pro dominator intake that i would like to use on my 340.It made 640HP on the dyno with a singleplane and a dominator.
Any pics on an tunnelram/blower intake?

To start to measure for the blower nose you go off the front most intake bolt to the front of the crank damper[straight edge]and start subtracting the blower case length.

I wrote some general remarks on my site here:
http://victorylibrary.com/mopar/blower-GMC.htm

Polysperic, thanks for the info that is exactly what I had in mind I just haven't selected the manifold. I just dug up a picture of the W2 tunnel ram and the plenum is much smaller than I remembered. It could still be made to work but you would have to build a plenum. I have saved a sheet of 5/8 aluminum which I will use for the blower mount. Clanton I will be using an X block I've been using for a number of years. In current NA form it is about 600hp, maybe it will hold 900 to 950 for some period of time.

you may want to do a half fill on the block,main cap studs[caps?],The proper steel rod/bolts.

There's another intangible factor involved that I didn't address.
GMC etc. blowers do not actually compress the charge internally, all boost occurs when the engine's capacity is fully satisfied (manifold vacuum is zero) - boost is pressure against the previous intake cycle. If the blower is too small or spun too slowly not only is boost = zero, you will have big pumping loss and vacuum @ WOT: negative horsepower.
This means that the time to develop pressure is somewhat affected by plenum volume - more storage = slower to pressurize.
Regarding discharge port location, it's not clear in my remarks. Any straight rotor should just have the window (more or less) centered over the plenum like dual carbs. Any helix rotor will tend to charge nearest the front, even if the port window is rectangular. I have a gut feeling that some running older helix blowers with square windows have plated the windows into triangles to reduce charge temp and improve mix distribution, but they're not talking about it!

fed, here is a link concerning SBM tunnel ram to blower manifold. Looks like these boys are from your part of the world. His work on the Pro Dominator is exactly what I would contemplate. My son found this link for me and I just saw it last night. Anyway looks like a lot of work but could be done. Might be better to get one of the Indy Modman manifolds and modify it for a W2. If anyone has additional info sure would appreciate it. Thanks, Max

Get a Whipple screw up there and thank me later. No comparison to an old roots style charger.

Way more power, with way less heat and looks killer. 1000+hp with 93 pump gas on a good small block and drive anywhere.