How does a solid roller cam act vs solid flat tappet

MOPARMAGA said
Great that made perfect sense, it doesn't make it smaller, it moves it around in the rpm range.

Ever so slightly. The feel of the move is due to added stroke. If it was added bore, then it (The cam and engine feel) would just wake up more.

That's why a 383 cam is higher rpm rated before it makes power than the same in a 440, got it. Thanks alot. Eased my mind. I'll check out his build. Again, thank you a mcmillion

Yes, as said above. The bore and stroke combo is an active player in the engine feel. The smaller engine (small stroke, big bore) has to make more rpm to move a similar amount of air where the cam starts to come alive. It’s operating rpm band. The larger engine, has a similar bore but the stroke is a lot longer. This extra travel is moving more air sooner and longer. Because of this, it is taking in more air and fuel making more power sooner. This makes the cam feel smaller.

Also, 273 makes a good note about the cylinder head selection which you have covered. But if you back up....
In the small block arena, a 273/318 head has small valves. 1.78-1.50. A stroker small block that has moved up to a 408 or even a 434 will not breath very well and it’s performance ceiling is, well, pretty dam short since a really nice head for that would be a set of trick flows or greater if raced. You could use a Edelbrock Victor Head with (IIRC) a intake valve at 2.15. These heads would produce spectacular results by themselves never mind a 318 head flowing 160 cfm vs the Victors 370 cfm.