there are many many write ups regarding DPFI->MPFI as well as mini-me vtec head swap
vtech?
VTEC
mini-me sohc vtec head swap should yield about 130 horse...
but you need to activate vtec so you have 4 choices...
1. ghetto ass RPM activated switch
2. VAFC
3. OBD0 vtec computer, pw0 or pr3
4. OBD0->OBD1 converter and P28...
price all your options before you decide on a head swap...
you might find it cheaper and better gains to go with a ZC swap, or even B18 or something if you find a good deal...
vtec head costs at least 100
prob another 100 for the parts to swap DPFI->MPFI
intake mani, resistor box, and si ecu to name a few...
plus head gasket set...
the p28 = 100+ easy, OBD0->OBD1 converter = 100+
VAFC = around 250...