bigger tires, 3.42 gears?

[DRobb's_85]

My 85 K10 has 31x10.5's that are going to need to be replaced pretty soon. Its got a 2 inch lift on it, so I'd like to throw some 32's on it this time around. My problem is gearing though. Its got stock 3.42 gearing according to the glovebox, and I'm wondering if these bigger tires are gonna hurt my 700r4..I know it will be slower, but how much slower? It gets around alright i guess as of now, its got a crate 350 with headers, but I cant afford front and rear gears right now. So, its either stick with new 31's which imo look dumb/ too small or step up a size and deal with the lack of performance, what do yall think?