The 90 maf is probably overkill. You'd want to keep your tb and maf around the same size. I have a 75 tb, and a 76 C&L maf. A 90 maf may cause idle problems as well as a/f ratio problems without tuning via a chip or eec tuner. Same with 42# injectors - tuning for them is recommended, but I've read accounts here of people using them without problems. But 42# injectors would go along with a bigger fuel pump, like a 195 lph.