Most nice framesets in the early 70's were in the area of $400 if my memory serves correctly. Some were a little less and some were a little higher. I believe a Paramount was around $375 in the late 60 's but took a big price jump in the early 70's. I think the Paramount tandom was $450 to 475. This was still a lot of money. GM skilled trades were making about $4 an hour.
Just to add to the mix: According to a
1975 Masi catalog suggested retail for a Reynolds 531 frame and fork was $345; Columbus was extra. So your memory serves you well, dit.
As an aside, the suggested retail for a full Super Record equipped Reynolds 531 Masi Gran Criterium was $1095.
stan