Installing a 6.1 Hemi in a 70 Challenger got a question (maybe more to come as well)

[challengergary]

I am installing a 6.1 in a customer's 1970 Challenger and came across something that has me a little worried. There's a big ole hole that looks like something important might belong there. Should i be worried about this?

 

[5.7 hemi]

Not at all. That is where the block heater goes, so just keep plugging along on the challenger......and post more pics!

 

[challengergary]

Awesome! Certainly don't need one of those down here!