I bought the polished aluminum Wayne valve cover and side cover from Patrick's a couple of years ago and installed on my 235.

The studs were simple to install, and real positive bolt down, no leaks.

Suggest you use the 216 valve cover gasket. You will likely need to make or get a spacer to install between the head and the thermostat housing. An option might be to shave the rear of the thermostat housing (it may not be thick enough to get claerance this way). This is necessary because the thicker aluminum cover fits the OUTSIDE perimeter of the original flanged cover.