Sorry for late post. 1st time seeing this OP topic.
You may be interesting in this 1974 Jag XJ12 Hot Rod called Draguar! for some ideas for your Poncho transplant
http://www.hotrod.com/cars/featured/...acing-draguar/
Quote:
Our XJ12 is one of 4,744 made, if Wikipedia is to be trusted. Rare? We take it to mean no one wanted 'em when they were new. Why have a 326ci Jaguar V12 with just 265 hp when you can swap in a 350ci Chevy V8 with just 265 hp? Countless people did exactly that in the '70s, and that power number might be a tad generous for the marine 350 beneath the Weiand blower. It was a late-model, roller-cam motor, but pre-Vortec. It had those annoying center intake bolts that are at a different angle than nature intended, so the supercharger manifold had to be hashed to fit. Wild guessing put the compression ratio at 8.5 to 9.0:1, and the cam was probably the 198-at-0.050, 1?8-race special. It also had stock exhaust manifolds. We knew we could make the cast pistons survive at low boost, especially with an MSD distributor and 6BTM ignition box that retards ignition timing in proportion to intake psi. We'd also rigged an Auto Meter wideband O2 gauge to watch the air/fuel ratios--which were dead-on perfect throughout the driving range with the out-of-the-box Holley 750-cfm supercharger carbs.
Read more: http://www.hotrod.com/cars/featured/...#ixzz3OiMQJjm5
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Was very common to see XJ6 drivetrain transplants (SBC & BBC mostly) back in the day...so your Pontiac idea is a variation on the theme. Used to be co.s that advertised conversion kits in Hot Rod & Car Crap
Here's a YouTube Roadkill episode
http://youtu.be/-gfQ4jzUEwU