$$$ And a shoe horn.
If you get it high enough and just drop it, it'll go right in!:laughing:
Really, you'll need BB brackets for the power steering and A/C, exhaust manifolds or headers, and some time. If you find a 454 that's complete, (all the brackets and pulleys) you'll need to probably change the water pump, I think the Vettes used an odd length pump. Distributor is the same. Use the power steering pump that's on the car now, or change the relief valve. I'm not 100% sure if the pulley diameters are the same for all the BB's, so that may be an issue too. My 69 BB has a 2 groove water pump and crank pulley. The back groove on both is just for the water pump, then the forward groove runs the P/S, then a 2 groove pulley on the P/S pump, back groove runs from the crank/water pump and the front runs just the alternator.
The tranny will fit, a TH 350 won't last too long unless it's been helped with a good shift kit and is reasonably fresh. A 4 speed will fit right in.
Probably need a bigger radiator too. The wiring will all be the same, but maybe not long enough.
That's all I can think of right off the top of teh old noggin'