Battling overheating new 360 build

Back off the timing to 34*. Get a temp gun and read the upper and lower hoses, you should have around 10* drop if the radiator is good.

I'll bring it back to 34, however this is part-throttle driving on backroads ~40-65 mph where I'm having the problem, I'm not all in anyhow. Maybe I'm getting too much from the vacuum advance?

shroud should cover around 2/3 of the blade and have just enough room at the end of the blades to get the v belt through make sure there is no place sucking air at the shroud to radiator

I definately don't have that. I have maybe 1/3 covered and the fan 2 1/4" away from the rad. The new spacer should bring me 1 1/4" away and cover more of the fan. I don't think I'll buy any parts until I test this out