I had a 1975 2wd Blazer--fenders still had "K5" badges from the factory!--you'd think they would have called it a "C5",but nope!...it came with a straight 6 ,a 250 camel humper with a one barrel carb,and a 3 speed manual trans--...I tried endlessly to get the carb to not "surge" at cruising speeds,tried fooling with the APT screw your not supposed to touch,and I gave up and put a 307 V8 in it I had from a parted put '71 Suburban K-10 I had..A friend was scrapping a '74 Vega,so I got a free Saginaw 4 speeed for it,it bolted right in with no modification other than having to use the shifter that came in the Vega on it...the thing was fast,it would leap off the line like a jack rabbit,I used to blow Mustang GT's off until I got up to about 50 mph with it at stoplight races!..
Wish I had kept it in a way,I sold it for 450 bucks,,I had paid 150 for it--it needed floors and door bottoms,and new rockers when I got it...I was into 4x4s more and didn't use the truck enough to justify keeping it,but had I known they would become a desireable collector item for the "low rider" crowd ,I would have hung onto it longer and tried selling it for more than I did..I liked having a "summer" Blazer that rode nicer than a 44 and still had a convertible roof...its funny how a lot of people went Ewww,2wd?? whe they saw it...but now a lot of them want one,and few still exist!..
I passed ip a '72 2wd one for 150 bucks back when I had that one too,another 6 cylinder one..that one would be worth even more than a 73 up one now!..