WIW Stage 2 360 Magnum Heads

Will these even work for me on a stock 318?
They would.
Those aren't bad numbers at all, the ex is without a pipe ? If so ..just add 'my rule of thumb' 9-14 cfm to the numbers.
To me they would look like this
.200-113
.300-149
.400-184
.500-196
.600-198

Something like that.
Decent.