ya'know what, I was thinking the 2300 for the 500cfm, the 2100 is actually 425cfm. Well, my 289 is stock with 11:1 compression and a full exhaust and I keep from buying an intake for it cause the 2100 has just been awesome for me. I have a 300 straight 6 in my f-150 with a custom 3 piece header, offy intake and 390 cfm holley 4 barrel. Just buy a low pressure electric fuel pump from your local autoparts store, you don't need the block mounted pump.