Can small block oil pump be replaced without pulling the engine?

I've done it several times;
68 Barracuda, 360 4-spd on a 70 Duster K with biscuits. TTI Headers, Milodon Road race pan (with tray) with the side bump-outs, and steering from a 73 Dart.
On my back of a cement floor, or on a 4-post.
Either way, I thought it was pretty easy.
on this Barracuda, I think I did that at least three times maybe more.
Done it on other 67 to 75 A-bodies too, with SBMs, but with stock pans .

A tip for reinstalling is to put a couple of line-up bolts, one on each rail with the heads cut off and the shanks slotted for a screwdriver. Then it's just a slamdunk.
Don't forget to pull the dipstick out before you start, and Disconnect the Battery.......

Lol, well if you think it was easy you can do mine next time.

I had to drop the steering link, lift the engine 2” (max, T56 hits the tunnel), unbolt the headers from the flanges and the heads (left them hanging), pull the radiator hoses, slide the torsion bars back, unhook the steering coupler, separate the lower ball joints and drop the entire K frame down to get the Milodon road race pan out on mine. Car on jack stands, engine on the hoist and the K balancing on the floor jack. The spool mount K and the QuickTime T56 bell make it MUCH harder. And honestly, I think any SFI bell with a block saver plate would make it a lot more difficult, doesn’t have to be a T56 bell.

Possible? Sure, dropped the pan, replaced the gasket and rear main seal. Easy? Not a chance.

Like I said before, it’s completely dependent on what components you’re running. Stock stuff? Sure, easy. Aftermarket stuff? Depends on the combo.