Slant six over size valves

There are many valves that could be made to work, but that would be more expensive then the valves I'm looking for. I have a head I started building about 30 years ago, and never finished. Might have to do that. It uses Perkins diesel exhaust valves #V1803 as exhaust, and Mopar 413 # V2254X exhaust valves as intakes. Had to cut the head dia, still need to put the face on the valves, and open up the seats, and ports/pockets.