milled heads

Can anyone tell me if I'll need custom pushrods with milled 360 heads?
Here's the engine info:
'78 318 stock flat top pistons
'80 360 heads ported----- not milled yet!
CompCams XE268H
.477 intake lift .480 exhaust
Aluminum single plane intake
Flowtech headers
2.54 gears (3.55s on their way in)
standard transmission
Now I'm wondering if I had these heads milled .050 would I need new pushrods or will the stock ones be fine. Not racing or anything so revs wont be too high very often. OR if the heads were milled less would the stock pushrods work?

I also have some '98 magnum heads but dont really have the funds to get the aftermarket pushrods and valve springs and retainers, plus making the intake fit or buying a new one! even if i did the valve lift would be around .512 with the 1.6 ratio rockers which I'm guessing might hit the pistons?

ANY help greatly appreciated!!! especially about the milled head question :)

I DO have future plans for a roller cam/roller rocker 360 but that'll definetaly have to wait