well that is tuff to answer both motors had years that had very good horsepower figures and also some very horrible ones.if you put 350 heads on a 283 it will probably lose power. most 283s came with either 58 or 64cc combustion chambers.most 350 were 76cc. therefore you could really drop the compression ratio by putting 350 heads on. the 350 will probably have more torque9 times out of 10 compared to the 283.as they say there is no subsitute for cubic inches. you will have to spend more money with the 283 to get the same power out put.
_________________ don`t have the luv no more but I still like em.72 el camino, 00 & 06 silverado one 4x4, turboed vw sandrail,99 banshee, 06 raptor 700, 02 polaris trailblazer.
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