66 Dart GT HT Whatsitgonnabe?

Does anyone feel like educating a poor middle-aged man with no pushrod engine knowledge?

I know my engine ('72 360) has a Purple Shaft 4286630 cam. What I do not know is whether this cam is hydraulic or mechanical. I also don't know whether the lifters are flat-tappet or roller ones.

Can I use hydraulic lifters on a mechanical cam? Can I use ROLLER lifters on a mechanical cam? Can I tell what type of lifters I have without tearing the engine apart?

What are the pro's and con's of the different variants? Maybe there's a good tutorial (camshafts for dummies) somewhere?

Also, on the receipt from the engine builder it says "Keith Black Lite pistons, used". Is this enough info to determine exactly which piston it is? Is there any way of identifying the piston through the spark plug hole?

Thank you,

/rookie