73 318 upgrade questions

Do you have a 4 barrel manifold already?

The heads just clean them up and do a little porting on them if you can stock valves should be fine. there's a sticky about porting in the small block forum.

They make a thin head gasket you can grab that and bump the compression up a bit.

I think a cam like this would keep it somewhat mild

http://www.summitracing.com/parts/cca-20-212-2/overview/make/dodge

This cam is one of the most popular around here, its a bit bigger though.

http://www.summitracing.com/parts/cca-20-223-3/overview/make/dodge

Get a nice double roller timing chain for it.

You'll want to do something with the exhaust. There is a few options. Cheap headers are a pain to put in (the engine usually has to be lifted up a few inches and header tubes bashed). there is on set of shorty headers that work but they cost a bit more. I also think I saw someone who ran one magnum manifold and a 360 manifold. You could also spend A LOT of money on some dougs or tti headers that i hear fit the best. do some research in the exhaust forum and see what is best for you. Then of course hook that to a dual exhaust of your choice.

A little bit of converter would help nicely.

You might also consider grabbing some lightweight distributor springs and an orange box if you don't already have those.

It will be like night and day when you finish.