what to do with my rear end

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.

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I took the van for some time trials. My best was a 15.1 with a blown power valve. (or two) Currently it is a 318 that I built copying an engine masters build. Their motor made 415 hp and something like 400 ft lbs so we will assume mine does too. The trans is a 727 TCI Streetfighter with a 1800 stall and a full race TransGo shift kit. The rear is bone stock except new fluid. 3.55 gears. Everyone says the rear is killing me but before I toss a grand at some new gears and a limited slip, I'm considering swapping in this mild rv 440 and 727. Would the bigger motor make better use of the larger gears or should I still go smaller? What would you recommend?

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If you have the parts for a 440 swap, and this isn't a daily driver, go big! A heavy vehicle needs torque to move!
Oh, are you sure on the 1800 stall? that seems really low. A STOCK 318 truck converter stalls in that range.