newer 350 is: V0722TXD
V = Flint Assembly Plant
07 = July
22 = day of month
TXD = is a 350 manufactured in 1975 used in conventional cab trucks (C-20 to 3500). It was rated at 165 horsepower and was originally equipped with a 4 barrel carburetor. This could be a decent block assembly to build from.

older 350 is: F1109CKL
F = Also Flint Assembly Plant
11 =November
09 = day of month
CKL = is a 350 manufactured in 1973 used in turbo/hydro cars and equipped with California smog control. Potential for a build if you throw everything out except the block.
CKL was also produced in 1975 as a 262 CI motor used in Nova/Chevelle/Monte Carlo – not a great motor in it’s original state (displacement is just too small.. In my opinion.)

305: F0416DTY
F = Flint Assembly Plant
04 = April
16=day of month
DTY = is a 305 manufactured in 1979. It was used in auto transmission full size cars and rated at 130 horsepower originally with a 2 barrel carburetor. This one was truly a “gutless wonder” and a dark chapter in Chevy’s history. 305 is not the best motor to build for big HP or torque, however, they can be built into a "respectable" 250 horsepower engine for a daily driver that sips gas and is dependable.

Regards,
Glenn