Out with the 318 in with?

I would find a 360 short block, and use the X-heads.
Comp Cams XE262 or XE268 work well.
For intake, Ede RPM or Air-Gap.
Your 600cfm Eddy will work great for now. Eventually go to a 750.
Nothing to crazy on the stall 2300-2500.
340 manifolds or TTI's
Just some ideas. Pretty close to what I run in my 70 Dart, and its a little tire shredder.

$1000.00 will be tough. Depends what you get the 360 for and if it needs machined.
There is a guy in the Los Angeles area Craigslist selling a complete 360, all machine work done,with boxes full of new parts for sale,complete short block,$700. That means he will take $500 or $550.
Theres deals out there, and cash is King right now. Take your time and search, Craigslist,Ebay,This site,borrow,barter,what ever it takes to get the parts on the cheap. This is actually a very fun process.Just take your time and look.