New To 67-72 Trucks Need Help

[JBARTGMC-10]

HI ALL REALY LIKE BORAD I HAVE LEARNED ALLOT ALLREADY
I HAVE JUST GOT A 70 GMC CUSTOM C-10 LWB WITH ALL OUTER TRIM IN GOOD SHAPE VERY LITTLE RUST JUST SOME REAR CAB CORNERS VERY MINOR NO DENTS JSUT HAVE BRAG ON DEAL OF THE YEAR IT RUNS BUT NEED MOTOR ONLY PAYED 400 BUCKS
FOR THE TRUCK POOR GUY DID NOT KNOW WHAT HE HAD HIS LOSE LOL
MY ??IS THE BADGE ON SIDE SAYS 1500 V-EHIGHT HOW DO I FIND OUT WHAT MOTOR WAS ORIGANL MINE HAS BEEN CHANGED I KNOW I THANK IT IS A 350 IT HAS NEW CARB ,DRIVE SHAVT ,BATTERIE,GOOD DIST.

THANKS TO ALL WHO REPLY
JBARTGMC-10