318 Heads on a 273 ?

I want to get rid of my stock 273 cam/lifter/rocker setup, period......I'm tired of the noise and inconsistency......

What I want to know is this: Will a set of stock 318 heads mount up to my 67 273 with no problems, so I can convert the setup completely over to hydraulic instead of the solid ?

I'd just like a quick, inexpensive and easy way to convert to hydraulics.......

Any advice on how to get this done? (and no, I'm not going to pull the motor and replace it......I'd like it converted)