chevy style HEI on 318

Only the people that can put up with that big nasty thing hitting the firewall or wiper motors use those in small block cars. :D

There are sooo many better options that are not so intrusive but are exactly the same function wise.
Here's a few for you to look at.
classichei.com also advance modified and recurved distributors. (Me)
4secondsflat.com (aka FBO) also with rev limiters and advance modified distributors.
"Ready to Run" distributors found on ebay cheap. (Probably the best bang for the budget buck)

What you are asking is about an HEI swap and there is a lot of info around about it.
I myself have the HEI conversion kits that we sell on both our A body Mopars that use the stock electronic Mopar distributors.

Here is one of my kits installed on my own car, but they can be mounted pretty much anywhere.
This uses the factory electronic style distributor and is true HEI.

Removing the old system is a breeze.

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