go for 4efe ! power, economy, efi , E block will fit bolt on to ur E chassis ! going for A series engine u will have to alter the timing belt side mount ! better to stick with E series engine ! or if u want more power then 5efe
as for ur querry about 4age 16v ! saw it 2 weeks ago in mint condition ! engine was same rate as 4afe or 5afe i.e 75k