Should I go Big block or Small block?

Just go 340 .060 over like I did years ago 1984 yields about 356-357 cu.in. 400+ hp easy before spending some serious cash. Leave stroke alone because thats the beauty of the 340 shorter stroke quicker to reach the power band than the 360 stroke, thats the big block disadvantage. So ur cubes are your only handicap. I sleeved all 8 cylinders to make walls stronger with more nickel content at .060 overbore then you should pick your compression ratio for what your use is going to be. Oh! Go with roller cam too and you can use 360 heads with j production stamping to accept 202 intake valves or the original x stamping with the factory 202 in 1969. Have fun, I did.