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305 heads work on a 350 engine
Around 375
Need to know the year.
YES, A 355 is just a 350 bored 0.030 over very little difference.
In the mid 300 ish Hp
Stock 350 horsepower. With all the mods you can achieve 1,250 horsepower. (But you run the risk of blowing heads.)
I had one with 10:1 compression that was making close to 350 hp with decent heads.
Why 400 heads? They are notoriously bad flowing heads without much modification the engine would be about 360 cubic inches, but the heads have nothing to do with the size of the engine.
No. 305's have small valves due to the 305's small bore. Large valve heads can't be used on the 305 because the valves will hit the cylinder block. 350 heads breathe MUCH better than 305 heads. Stick with the 350 heads.
carb, cam, intake, headers, heads, msd igntion, or a 350
All else being equal, about 10 more than it had before.
350 Chevy's have been around for 40 years, and the horsepower has varied from a low of 145 horsepower to over 400 in factory configurations. It depends on the compression ratio, type of heads, cam, intake, exhaust, and many other variables.