M&H engine harness difference small block vs big block 69 barracuda?

Have a 69 barracuda originally a 318 car. Now has a 440 installed. Going to purchase a new m&h engine/forward light harness and want to verify all the differences between a small block/big block harness. Only thing i can think of the distributor and the temp sensor wiring being different lengths? Are all the body mounted components in the same locations? The Big block harness is $ 100 more than a small block harness which makes me think it is very different - thank you!