10a is a waste if time.
No parts available new, like seals and all is now expensive and collectable.
The solution is a single rotor made in sydney for light aircraft. In NA form capable of 135-140hp 4port and 180hp NA for the lates 6port renesis plates (remember the renesis setup has the exhausts on the sideplates, 3 in total compared to two for the older setup, so it will have double the exhaust flow for a single renesis setup as it has two exhaust exits compared to one for the older setups for a single rotor) with halve the noise, double the economy and halve the cost for future rebuilds. Also fits into anything.
The best solution is this engine with a snail.
Youll have no noise, can make 300+hp and should be good for at least 30mpg with normal driving. Gas setups work best with rotors and will give another 60 per cent extra change in your pockets.

This pic is of one that has been powering light aircraft around the world. Another setup is good for 130hp and 35-40mpg on the road with an untuned 48mm ida weber (previously off as bridge port 12a) and now powering a heavy s2 rx7 in the sydney streets for 5000 plus kms without a hitch.
Imagine we can have a huge space for an intercooler, fans, radiator and more!