Stock 360 with bolt ons - options

Hi all, got what I'm 99% sure is a stock 1986 360 with 727 driving an 8.25 rear with 3.23 gears in a 67 dart. It's got an edelbrock avs2 650cfm carb, old msd 6al with hei distributor and dougs ceramic headers with big twin pipes cut at the axles.

Engine seems healthy and it runs well, but I'm looking for a bit more power, what are my options to squeeze some more out of it, say around the 300hp mark?