Low Mileage Hydraulic roller 360 LA and $1000.00- what would you mod?

I am taking on a small project for someone. Low mileage 89 360 out of a truck. He is dropping it off and 1000.00. Motor runs great but want some performance increase but it will be a daily beater and will retain HP Exhaust manifolds which he has now.... Fuel management is a Holley Snipe and MSD ignition.

The only other thing he is bringing is a set of low mileage 915's done about 10 years ago.

So what would you change? If he sees anything near 300hp it will exceed his goals....

JW