I'm sure you could but if it was me I'd go for an injected setup with a turbo, carby turbos, while doable - are a real P.I.T.A. toyota had a real nice injected setup on the 7KE (which i compare to the datsun A series) which bolts on to most of the earlier motors. I think there was an injected A14, but I'm not sure which models had them. I've only ever seen A15s in forklifts which were all carby apart from the ones that have been fitted to early dattos. If you can solder okay you can get a meqasquirt setup for a few hundred bucks and it has programmability comparable to the ECUs costing 0000's as long as your slightly technically savvy and can work a laptop.