Since transplantation is on decision, rather to transplant V6, I suggest to go for E2, same engine code, same mouting. And if stick to stock without modification, E2 will make almost the same fuel comsuption as V6 did. Power-wise, E2 is better.
i totally agree with kk9972. get a 4G63T engine, but first make sure in good condition.
here is the power output for these engines
1. 4G63 = 118bhp (like in Perdana SE)
2. 4G63T = range from 220-280bhp (from galant Vr4 to Evo3)
3. 6A12 = 150bhp (as in perdana V6)/ 170bhp for JDM with sports ECU
4. 6A12 mivec = 190-200bhp
5. 6A12TT = 230-240bhp
figures from wikipedia.org