Sarah,
Sorry for the delay, I found the following information that might be helpful to you:
Code Year CID Vehicle HP RPO Trans Carb Comments
CKD 72 350 Nova 200 L-48 TH 350 4-Brl
CKD 72 350 Chevelle 175 L-48 TH 350 4-Brl
CKD 72 350 Camaro 200 L-48 TH 350 4-Brl
CKD 73 350 Nova 175 L-48 TH 350 4-Brl A.I.R.
CKD 73 350 Chevelle 175 L-48 TH 350 4-Brl A.I.R.
CKD 73 350 Camaro 175 L-48 TH 350 4-Brl A.I.R.
CKD 73 350 Camaro 175 L-48 TH 350 4-Brl A.I.R.
CKD 74 350 Impala 160 LM-1 TH 350 4-Brl A.I.R.
CKD 74 350 Chevelle 160 LM-1 TH 350 4-Brl A.I.R.
CKD 74 350 Camaro 160 LM-1 TH 350 4-Brl A.I.R.
The head casting numbers 3890462 show to be from:
302/327/350
62-68
and can have the following valves: 1.94/1.50 2.02/1.60