I seem to be in the minority here, but I chose a 1776 cc engine when I built my car. (a "bottom feeder" engine as Stan describes it... ) My interest in a Speedster is the old technology. I love old machinery/equipment. I have an old 2 cylinder JD Model A, old Atlas lathe, old milling machines, etc. I love anything that is pre-1970 technology! Also, I wanted dependability with a little extra performance. But at the end of the day, we have cars that were built by 1950-60 standards. So, to be a little more "authentic", I wound up with a 1776 with a W100 cam, balanced rotating assembly, larger heads, full flow, external oil filter, 34 ICT Webers, 8½:1 compression and Vintage Speed exhaust. It is perfect for me. It has been very reliable, no heat issues (even in the Texas summer) and a lot of fun. With a 4.38 IRS trans it is quick off the line and is still good at 70-75 mph.
It's a personal decision based on your interests. Don't get me wrong, I like power, but this car is more about the novelty and nostalgia for me. I am currently trying to talk my wife into an early C3, 4-speed Corvette for a little more power. But, not to get rid of my Speedster!