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If you have not opened the fuel pump yet that is the 1st mod. Quite easy to do. As you start running in excess of 150 hp you will want to go the a diffrent charger. The Schwitzer 3-LM 466 is a great charger and quite inexpensive. You can go to larger tips on the injectors and gain quite a bit for a small expence. If you get to the point the pump just is not delivering enough fuel you could try a pump from a Mack Maxidyne 639 cubic inch engine. Those have a larger plunger in them, yours is a 9 or 10mm the Mack is a 11mm. There are fuel shops doing a 13 or 15mm head on the model 100 Ambac pump however those are quite radical. Good luck