Is My Engine A "roller"?

If you could find the casting number on the block, that would tell you for certain what year it was. It should be near the front of the block by the starter?

Barring that....pulling the intake off will tell you for certain, as the lifters, dog bones and hold down will be apparent. You might be able to pull off a valve cover and look down the pushrod holes with a flashlight to see the tie down bars (dog bones)?

These are what you'll be looking fore when you shine the flashlight down....



....they're designed to keep the lifters from rotating in the bore. If you haven't got them (or at least provisions for them), or some sort of link system keeping the rollers straight, you haven't got a roller block.