It should be a 33 or 35 PWK, if it came straight from Trinity.
72 Pilot Put a 50 or even 45 in and lower the needle to the third position. The 4th is great with pipes, but with stock pipes, the 3rd would be better. The 50 might not be perfect, but starting and idling should be better. Your going to have to jet your main, or make sure your plugs are coloring perfect, then fine tune the pilot to start and idle good, and it's dependant on your elevation..
With pipes and reeds and all, I'm running a 55 pilot and 220 main at 700 feet. I'd say 150 is maybe close, you might need to come up a little, but you might need to go down some also, you'll just have to do some tinkering.
No prob. Patience and this prob will be overcome.