I think the L20B will do good in the B210, since I already have it, I will need only one other engine for the 610, the VG30 is not a bad idea, and the 610 can handle it.My only issue is with my rotary side, perhaps I will, if going the rotary way, put the L20B in the B210 and a 20B 3 rotor Mazda engine in the 610. As of now, the best way would be, perhaps,l get a 280ZX transmission for the L20B, dual DCOE's and cam to begin, Since the 610 got exempted already, will drive it like that, at the same time will work on the other motor,look for a VG30, or a nother type,perhaps the 20B rotary, when time comes, swap it into the B210(L20B), and then freinkenstein myself with the 610, crazy Datsuns!, imagine, with the money I would spend just in a down payment for a plastic FWD pipiHonda, I could get a crazo Dat!....never a plastic tub, only Datsuns!