Well I hope it's worth it SB To Big Block

Here's my 340 Duster 727-auto, 489 posi built for street use made 3 passes at the track unloaded off the trailer and ran 2-12'2 and a 12.3 no tuning took the mufflers off and went down the race track, on the street you better be on your A-game because that little 340 turned on quick and hard, this summer I met a guy named ray who has been building and racing big block mopars since 1962 and thanks to Ray I ended up selling my 340 and auto, for $1800.00 and as luck would have it, the guy also had a big block 727 auto trans to boot, trans came with a TCI true 8-inch converter, low gear has been changed good hubs, trans-brake, deep trans pan, my 340 car was not numbers matching but was a true 340 car, now it's being built my way, Big Block 451 stroker motor fender well headers, 727-auto, mini tubed, I'm thinking ladder bar set up or idea's from any one that's got there power to the pavement, I think my 8 3/4 rear should hold up to the big block power? My motor 400 block bored .060 over and filled with K&B slugs 12.5.1 440 cast crank mains turned down to 400 size counter weights shaved 3/16 , 440 rods worked over, Launti 640 lift roller cam, roller rockers, Steel heads with major up lift ported and polished 225 intake valve and 184 exhaust wiend intake 1050 carb milodon oil pump kit , gear drive, head flow is new to me but Ray said they flow up around 350 ? he saying motor should push around 750 HP should be on the road end of march I'm hoping, P.S cast crank is coming out, I found a steel crank to go in, and looking into adding Hemi rods that I just came into , Well I hope it's all been worth it, my friend Ray sure made the cost of the motor worth it I just hope it turns on better than my little 340 did