i have a 327 with 350 heads on it/...it has run fine for about a year....all the sudden it boggs when i give it gas.....idles fine...i have changed the distributor. wires. plugs, and intake gaskets.

i didnt a compression test

150 in all cylinders.

any ideas???  

Accelerator pump diaphragm?  

Gib has the right idea... I had the same problem with my 327...mine had a holley 600 #1850... if it's not the accelerator pump (check the clearance of between the pump cam and the actuator, should be like .015 celarance or something like that) if that all checks out good, then the squirter nozzeles are either too big or too small... seem like mine were too small.  I took hand drill, can't remember the number and boared it out... fixed by off idle bog.  Runs like a top now.  

Since it ran fine in the past and all of a sudden has problems, I would check that accelerator pump or something as simple as water in the gas. Accelerator pump adjustment is 0 clearance between pump and lever, at idle. No up-dowm play, just light tension on lever side to side movement. It must be re-adjusted any time idle speed is altered. Good Luck.  

what does the 327 with 350 heads make the displacement  

Displacement is the volume that the piston "moves." May I ask how you think changing the cylinder heads affects displacement?