As Danny said, Stan's got it covered, and is what I was referring to (but never got back to map out) yesterday. Either version (with or without aftermarket mainshaft) will be fun to drive!)
@DannyP- I have heard that the end of the pinion only needs about a millimeter taken off to clear the Quaife- people I've talked to say it won't affect it's life. Look into it though- there are guys who have bought Quiafes and then sent them back because of poor machining tolerances, so if you buy one check it out thoroughly before installing.
Carlos- a 2110- 82x90.5 (or better yet, 2180 with thickwall 92's) will rev to 6,000 rpm, make 150 hp all day long and with an auxiliary cooler/fan (with thermostat for quick warm ups) and enough air into the engine compartment should be pretty trouble free. With tons of torque throughout the rpm range there will always be power on tap at almost any rpm. This would be (relatively) easy to build, last 70 or 80,000 miles if operating parameters are always kept within reason and make a really fun engine in your Roadster. A 2276 is the same engine with 94's- some more displacement so potentially a little more power, but 94's are known for only going 40- 50,000 miles, so depending on how many miles you drive a year...
A 2332 (84 mm crankshaft) and 2386 (86 mm) are the same engine with more stroke. Now there's a little more work (or $$$ if someone else is building it) to put it together, you have to keep a more vigilant eye on oil and cylinder head temps and make damn sure it's getting enough fresh air (or temps will skyrocket), but there is also the opportunity for substantially more power, especially if set up to go to 6500 or 7,000 rpm. 200 hp or more is possible. Some guys can successfully run this much engine in a driver on the street while for others it's just too much work. Always choices...
@aircooled- Horsepower is high end power, Bruce, while torque is the power everywhere else. Think of it this way- a small engine (1776, 1835 or 1915) might make 140, 150, or even 160 hp at 6500 or 7,000 rpm, but it's all high end power with not a lot of torque/power 'below the curve, or in the area where we do most of our driving. I've run an engine like this in a street car (a Cal Look Beetle, at times my only transportation) and although (with close ratio gears) the car was reasonably fast, if I was loping along at 2800 or 3,000 rpm and wanted to really step on it I had to drop a gear as power was 500- 1,000 rpm away.
A stroker engine will have substantially more power on tap from idle on up, and it it's set up to peak at 6,000 rpm the 3,000-3500 rpm 'sweet zone' will be that much lower and way more fun to drive.