Overheating new 360 help

no water transfer into oil yet. Timing set to around 38 last time I had it running. Pressured up cooking system before starting. Radiator is from Napa as listed for an 81 w150 with a.c. no shroud just don't have one. Water pump is a known good Used one. Have not worked on it since due to carb needing a adjustment and having to buy a mini starter to properly fit with headers