5.3 heads on a 6.0

i just bought a 6.0 lq4. i found a set of 5.3 heads from a 2000 silverado on craigslist. the owner says there is roughly 47k on them and he is only asking 100.00 for the pair. i know they have a smaller combustion chamber, but how much better will they be if i also swapped an fbody intake onto the motor as well?
basically anyone know the compression ratio with a lq4 6.0 w/ 5.3 heads?

save your money an buy a set of 243/799 heads they flow WAY better than the older 5.3 heads.
if you mill the heads .025 you'll have a 10:5:1 compression on a stock head gasket roughly. but if not you'll have a 10:2:1 or 10:3:1

trust me go with a better head.