I would think so, assuming you aren't running a ton of lift. Lots of 445s out there with CJ valves. I run a 1.67 in a D2TE-AA head without any issue.
Years ago I played around on the bench with a C8AE head with a 1.67 and it didn't hit a standard bore on the exhaust side until the valve was well below the guide (no spring of course). I would expect yours to be the same. Be sure to check that and radial clearance on the pistons though, some 390 pistons have pretty small eyebrows
