Dual Revo 3.3 BL conversion build-up

[Topspeedtimmy]

Got the first roller off ebay for 250 a couple days ago, it even has the RC monster mount already on it, full RPM arms, battery straps, and apperently locked into 2nd gear too! I'll have a mamba 4600 in it for quite a while, then I want to run a Feigo 8XL on 4s 4400 mah cells on it, does anybody know what kind of runtimes and gearing I should get on this set-up? Im thinkin' some 1st gear action and small pinion with mamba; and 2nd gear medium pinion with 8XL. Too bad I won't have a pinion for it until RC monster gets some of those 1/8'' in stock.