You'll need engine and transmission mounts for the conversion.
Check your drive shaft length and type. If the new engine is fuel injected then you can expect to revert it back to carbeurated, which means a new intake manifold to accept a carb. You will likely have some clearance issues with the engine and will need to research some headers that will fit the application since I doubt the stock manifolds will fit the tight clearances. A huge thing is to make sure you also get distributor clearance against the firewall! Often times things get too tight and your distributor gets broken while dropping the larger engine in. A radiator change could be needed if the old one doesn't accommodate or is too small to cool the big block.
expect a challenging(but fun) job ahead!
