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You would have to significantly cut the deck down ( .400 ) to make a tall deck fit in your car. It is for this reason I would not recommend the swap.
The difference is deck height, intake, distributor, and the tall decks came with 4 ring pistons. Heads, crank, cam, rods, etc etc will interchange. The intake will not interchange.
If the height of the tall deck is no concern , add a 4.25 stroke crank, 6.385 rods, the "regular" 454 pistons of your choice, and cut about .050 off the deck. Simple, cheap and easy 496.
Good luck with your muscle, Rick
The interchange was discussing your question of the differences between the two 427's. I only put in the 454 information on the pistons because you had asked about adding muscle to the 427 tall deck.
It's not the hood that is the reason most people have opted not to use the tall deck. The major reason is the modifications to the firewall. You will have too alter your firewall to make it fit.
Hope this helps, Rick
Your big block will fit right into your frame ( same mounting holes ) I would use the small block motor mounts as they are a lower profile.
As far as using the 427 you have, I say GO FOR IT !
It will be tight, but, you can make it work.
Best wishes, Rick
All 396,427, and 454 parts are iterchangable, except for the above mentioned 427 tall deck parts. Your heads will need hardened seats to withstand the unleaded gas. A mild cam is always a performance adding modification. Using the 454 crank will work, but the rods will need to be 'tall deck' if you don't do any deck shaving.
There are many more factors on this swap :
trans mount ?
As I am more of a restoraton expert, and not a modification expert I will 'opt-out' to another expert who might be able to help you with the rest of your questions about the unique way you are rebuilding your great classic car.
I am sending in a request for a refund on your accept, and will send you to well qualified hands.
Wishing you well, Rick