318 build advise

Hi guys,

First time posting on this nice forum where i spent hours to read threads.
New year gift, i'm about to buy a 1972 Dodge Dart swinger 3-speeds auto trans.
It's in a really good shape but i need advises regarding the engine.
It's a V8 318:
- The engine has been entirely disassembled and cleaned by a garage
- Camshafts SUM-K6901
- Edelbrock performer intake
- Edelbrock 4bbl 500CFM
- everything else is stock (pistons, heads, exhaust, valve...)

What's the estimated HP according to the current engine build?

What should be the next "bolt on" upgrade (1000$ budget) to wake up more the engine? If you have any references do not hesitate.
- Exhaust
- Heads
- ...?

Thank you !