LA vs. Magnum block

The Magnum 318 uses a 360 style rear main cap. The 360 Magnum and LA blocks are close enough to exchange EXCEPT for the head oiling. You can not use LA heads on Magnum blocks without the oil passages being drilled. Regardless of the lifters and pushrods used. I was going to make a fixture to drill this passage at one time but I currently don't have the need.

On another note I can't imagine trusting anything this shop has done. I'd take everything apart and check it with a fine tooth comb.