Hello BD,
I would like a faster A35.
Midget engines are increasingly expensive.
A midget engine costs between £450 and £600. A rebuild to "ok" spec costs maybe another £600. Good spec costs more. Exhaust + Manifold = 440. Inlet + SU = 150 (more for rebuilt). Rolling road time is perhaps £200. Good Dizzy £200 etc
So easily £2000.
Rover K series is a common moggy/midget upgrade but you hear horror stories. It also requires a ford Type 9 gearbox and adapter plate or bell housing. This is heavy and not cheap. I would be tempted by this. I believe someone (Andy?) has done this conversion. Would love to know from him how hard it is.
Sigma. Probably more fabrication than K series as only BD has walked this path. BD said the exhaust manifold was a PITA. Still needs heavy/expensive type9 gearbox.
Bike engine and box. Unknown difficulty. Possibly prop alignment issues. Potentially most likely to break gearbox/clutch out of the above options. The fun high revving nature could get tiresome quickly if it is used for more than a backroad/track toy. This is of most interest to me at the moment as I still have the option of liberating a honda blackbird engine from hibernation.
Having typed that out, I come to the depressing realisation that I should probably just be happy with my 948 until I'm older, richer and have spare time again
I also realise that I should have bought an already 1275 and disc brake equipped A35 to start with!
Summary: I don't care if the engine is big, small or medium, what I am trying to achieve is a reasonably fast A35 for as little money as possible.