Short list-
need:
water pump block off plates or crossover
logs and snails and hoses to transom, or headers
intake manifold
possibly a carb
front motor plate for bbc
chevelle or jet boat bbc oil pan, truck pan is too tall.
fuel pump, may have to go electric. (most fuel injected blocks dont have a fuel pump boss on the block)
alt. bracket
plug wires
Can re-use:
distributor
rear motor plate
driveline
starter
alternator & belt
balancer pulley
t-stat housing
sending units for gauges
oil drain hose/plug
that's all I can think of, there's prolly more...
Dan'l