Ever thought of any forced induction? A small(ish) blower or turbo set up could be done easily for under a 1k and would be tons of fun as most plp would tell you! SOO many plp have info on this stuff....or go one better than 1200rallycar and fulfill the A15TTTT set up lol

Or you could REALLY look and try and find some A series injection now that would be cool.....but expensive
But if expenisves the go then get a set of 4 Keihin, Mikuini or the alike motobike carbs! oooo their sexy and fun
If the enging swap is on, gona stay with the A series? surley, A all the way!

I could say more but money sux....

Good to hear what the next 'stage' is!

Dave