mr_bird said:
4 ci won't make much difference to the power. Stock 19lb inj are a bit small for 350hp, by my calculations. It would be nice to upgrade the maf and tb, if you still have the cash after the kit.
I would also recommend a fuel pump as follows.
You can't really get too much fuel pump unless you are talking about the $$$ expense, or possible noise. The regulator takes care of extra pressure and the return line takes car of extra flow.
Here are some recommendations that I worked out according to formulas I found in Four Stroke Performance Tuning by A. Graham Bell. Running at 80% of plump capacity helps ensure a long life from the pump.
_____________________80% of Max______80% of Max
Ford EFI Options_______N/A Limit________Boost Limit
110 lph________________240 hp__________200 hp
155 lph________________340 hp__________280 hp
190 lph________________420 hp__________340 hp
255 lph________________560 hp__________460 hp
I recommend considering future plans when deciding on a fuel pump.