1974 340?

Mtrhead said
Rarely someone shows me something I haven't seen this my friend I have never seen before wow if it's a marine 340 there should be certain style head

Mtrhead said
Rarely someone shows me something I haven't seen this my friend I have never seen before wow if it's a marine 340 there should be certain style heads

Appreciate the help, motor had 360 heads. I was told it was a 318 when I bought the car. Was pleasantly surprised when I found these markings but raised more questions.