Numbers Help

VIN (for reference)
1Z37J4S410527
Block
14510527- I see the last 5 digits match the last 5 of the VIN.
Heads- From inside under rocker covers.
K15 333 882
Could not see any numbers on either end of the cylinder heads. I thought this is where they were located, correct me if i am wrong.
Carb
704 7186
J53.
Says manufactured by Carter for GMC??? Maybe not original?
Rear of block, drivers side
39700
Any help greatly appreciated. Doing some long term planning.
Head Casting #333882 75cc combustion chamber 1.94 Exhaust valve 1.50 Intake valve1974-80 350/400
Not enough numbers for the block casting number, but you can look it up here:
http://www.jimsperformance.com/blocks.html

Head Casting #333882 75cc combustion chamber 1.94 Exhaust valve 1.50 Intake valve1974-80 350/400
Not enough numbers for the block casting number, but you can look it up here:
http://www.jimsperformance.com/blocks.html
Thanks for the help and the link, I will bookmark it.
The only other digit I found after the 39700, was another 0. The dial above was pointing at what appeared to be the 10 o'clock position.
Checking the link this is what I came up with.
350 5.7 71-77 H/J/K/L/V V8 OHV; Carb left hand dipstick; 6 bolt exhaust manifold; tapered seat type spark plugs
The only other digit I found after the 39700, was another 0. The dial above was pointing at what appeared to be the 10 o'clock position.
Checking the link this is what I came up with.
350 5.7 71-77 H/J/K/L/V V8 OHV; Carb left hand dipstick; 6 bolt exhaust manifold; tapered seat type spark plugs





