350 / 305 heads

[madmoggy]

Hi guys
I am after a bit of your knowledge please
I have a 1970 c10 which I got last year,the truck ran fine,plenty of low end torque and no problem laying rubber when the need arose.
It did have some oil leaks from the top end and a few weeks ago I decided to pull the heads off and do a top end gasket change.
I took the engine Numbers and it has a 73 350 motor in it so I took the numbers off the heads and it comes up as 305 heads.
will it be ok with these on ,the truck is not raced and generally I don't go over
70 to 80 mph
thanks Si