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[achieftain]

If you were going to opt for an off the shelf small v8 from GM the 4.3 in the trucks would do the job, but first either fill the trunk with lead to even out the balance, or build the engine as all aluminum. Now that I've said that, consider the new V8 in the GP GXP which has been narrowed (steeper v) and shortened to fit under the hood, crosswise. With a proper bellhousing any engine can be made to fit. And the GXP V8 weighs less than the 3800SC or even the new 3900 VVT in current GTP. I do think the 5 would be a good choice as it is already configured in proper direction, the bottom end would be already built stronger due to truck service, and the only cons are where to put the radiator and any weight penalty. But then againm it would not be the first roadster with a 60/40 weight bias. Cheapest route however is forcefeeding the 4. And what is so bad about 4's. Most of you are not old enough to recall that at one time prewar (WWII) all Indy cars were inline 4 Offenhauser. And I also reiterate an earlier post of mine, I have a 30 year old DOHC 0.9 k litre (900cc) Kawasaki engine that normally aspirated with 4 carbs is good for almost 90 hp. Add sequential port f.i and 30 year newer thechnology for a good 25% imcrease, multiply displacement by 2.67 and I could see a potential screamer in 2.4 DOHC of about 285 hp before boost. NOthing to stop going into the 325-350 range with a 4.