[bobcowan]

The first question is, how did the car perform before you pulled the engine out? Did the cooling system work appropriately? Was the carb getting plenty of fuel? Did the clutch slip? Don't "upgrade" parts just because you have them out. Upgrade those parts that didn't meet your needs, and keep the one's that worked just fine.

The second question is, how many miles on the car? if there's only 1,000 miles on the car, no sense changing much of anything. But if the car has 10,000 hard miles, now's a great time to replace the clutch, because a clutch change is a big job. But a fuel pump change is pretty simple, and doesn't take much time.

If the car has a lot of miles and the pulleys are fine, leave them alone.