I like the idea of the low 1st gear just for ease of driving plus you can go to a 3.08 or 2.73 rear end and cruise easy on gas. I'm sure you're 350ho is way stronger than my 400. Is yours aluminum or iron case?
67 Firebird 326 HO 4 spd Numbers Matching 68 Firebird originally 350 4spd Windward blue. Work in progress...