300 horsepower? If you take an 8.2:1 360, put 675 heads on it with 1.88/1.60 valves, do some throat work to the heads and get 184 cfm intake and 170 cfm exhaust @.400" lift, use an Edelbrock Performer 318/360 intake, a Holley 1850-5 4160 carburetor, Comp 260H cam, stock 340 valve springs and a set of Summit $130 headers. You will end up with something like this.....
RPM................TQ/HP
2500............363/172
2700............354/182
2900............362/200
3100............369/218
3300............369/232
3500............366/242
3700............366/258
3900............366/272
4100............364/284
4300............351/287
4500............341/292
4700............341/305
4900............326/304
5100............304/295
5200............299/296........end dyno run
Any additional compression, performance oriented intake manifold, cylinder heads, cylinder heads, cylinder heads or camshaft and this engine will really take off.