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TBF all things considered, a sorted 4af "should" be pretty comparable with the 4age, theoretically the lesser valve angle of the 4af of 11deg is more in line with what f1 and large capacity non hemi head drag race engines use. The problem lies with the really small torque based port size,cams and lower comp. It would probably cost $2+k to port the head to get it close to flowing similar to a smallport 4age. I made a set of 12.5:1 4af pistons about 10-12 years ago for a customer that had wild ported head, Ti valves etc. and a set of 312deg rally cams. Never heardback from him though. I do remember who did the cylinder head and I'm pretty sure Clive Cams in Lillydale does his camshafts(He doesn't advertise as he doesn't need too), if you decide to do it they'd be the people to get in touch with. You'd need to either sort out a larger carb and dizzy re graph too, or convert it to efi. First I'd do is a comp test to check bottom end conditions and think about it from there. One other thing to think of is most 4age cars are driven as designed, hard so may need a refresh too.