My $.02....
The 427 tall deck is not a hot rod performance engine like it's 427 passenger brother.
It is a good engine for towing, hauling, etc. But dont expect it to spin any serious RPMs.
Intake manifolds are a bear to find that use any normal street carb. 99% chance your will have a govenor built into it.
Stock 427TD heads are blah at best....
The pistons have 4 piston rings, and are much taller than passenger engine pistons.
However, if you ever intend on building a 540 stroker, the 427TD block is what many guys use. I have a 427TD engine block that will be the foundation for my next build. I will be building a 496 to go into my '77 K30 pro-street sled puller.