ok so... took the van for some time trials my best was a 15.1 with a blown power valve (or two)currently in it is a 318 that i built copying an engine masters build there motor made 415 hp and like 400 ft lbs so we will assume mine dose too the trans is a 727 tci strretfighter with a 1800 stall and a full race transgo shift kit in the rear is bone stock except new fluid im hearing its like 3.55 gears every one sayes the rear is killing me but before i toss a grand at some new gears and a limited slip im considering swapping in this mild rv 440/727 i have on the shop floor would the bigger motor make better use of the larger gears or should i still go smaller if so what would you recommend

"What to do with my rear end?"

That can be taken in so many ways. Whatever you decide to do with it, I don't want to know.

nope shes a toy and if/when i put a 440 in it it wont be mild and shes not all that heavy last time i weighed it i think it came in at 3100 just if i put gears in it now will i regret it later when i have the 440 in it?

If you think you have 400 hp I'd go looking for the 200 + hp you are not using yet???
at 3100 I'd think a 400 hp gross hp motor would give 13.0's even with 3.55 gears.
so cam, heads, intake, headers, carb and what were your 60 foot and 330's well all the numbers an mph all the way down.