I have an older Superformance (#131) and they are on number 2900-something now I believe, maybe 3000?... You can't beat that kind of a track record in Cobra replicas...
I don't know what some of the others on this site are talking about "more room", if you own one of the newer Superformances (past chassis #700 I think) it is very common for a 6'4"-6'5" driver to fit just fine in the cockpit of the Superformance... How tall are you?
I almost built a "kit" before I found my Superformance, and I tell you what, those 92" wheelbase cars look funny after only dealing with the correct 90" cars (like the Superformance)... I wouldn't get one of the "off sized" ones for more room, just get the Superformance with the bigger footwells...
I've driven mine in the rain on many occasions with and without the top on... Jim is right, at about 78 MPH the water hits the trunk deck behind you... It's hilarious! Any faster and the wake turbulence brings it into the cockpit behind you. Too much slower and the rain is likely to just fall into your lap... LoL...
Dealers: How many dealers does Backdraft have? Superformance has about 6(?) major dealers well spaced around the country and quite a few smaller-engine installers spaced even closer together... Great availability of parts "in country", excellent product knowledge from anything mechanical to paint codes for the unfortunate figerglass boo-boo...
SPF chassis is simple and yet stiff as a priest with a pocket full of Viagra at a summer camp for boys... That's all I'm going to say about that
I don't know about the backdraft, but a 385 series Ford engine fit very nicely under the hood of a Superformance... The newer SPF chassis can also fit a new Ford Modular engine! I know you were looking at a sb, but there is no replacement for displacement (that's another arguement all in itself)!
Finally, the BEST thing about a Superformance- The OTHER Superformance owners and that secret society called SCOF! I have never met so many genuinely "good" people as I have since owning a Superformance! Helpful to a fault. Kind, giving, like an extended family that has to be experienced to be believed, and it's WORLD WIDE!. SCOF... Well, I am sure you've heard the rumors that we control the weather, lets just leave it at that