There is no comparison. What specifically are you looking at "performance wise"? Mid 70's Camaros never got less than an inline 6 with 145bhp; Gear ratios, weight, etc etc all add into a formula. My little bored out 1500cc with twin carbs beat a newer (at that time 2001) Trans Am off the line, but of course cubic inches won out after a hundred feet. If you're trying to describe a kit car to someone, just tell them it's like riding a 400CC motorcycle. Enough pep to get you up and moving, not enough to really keep up in traffic.