LS Swap in a stock-height '72 4x4?

[joeydurango]

I'm planning to do a 5.3 LS swap in my 1972 K10. The truck isn't lifted or lowered, just the stock height. I've heard some folks claim you can't LS swap into a stock-height 4x4 because of clearance issues between the oil pan and differential. The guys at Pacific Fabrication - who seem super-knowledgeable and friendly, by the way - say the swap will work fine with their 4x4 crossmember and their low-height LS oil pan. I trust their experience, but wondered if anyone here had done what I'm about to do, just to confirm it can work. Anyone out there with the same conversion?