I just drug home a 70 (8/70 #9033) with AT and A/C, been sitting since 84 and all looks original. Had planned on a complete resto(floors and rails main problem) but the motor has me puzzled, it has the L24 stamped but the motor number boss is blank, parked way back in 84 and it looks it, still got the 2400 valve cover, right carbs etc, but I can't see any evidence of a stamping at any time. Oil, soap, brass brush, more soap etc, see nothing, I put a machinist straight edge across the 2 bosses and they are right in line. Looks to me if the number was ground off it would have knocked at least a couple thousanths off. What gives? Will not be a resto(at least by me) if I can't make myself feel good about it being the original motor. Factory(Dealer) replacement? Older swap?, it was 15 when it was retired, plenty of time to kill a motor and put in a rebuild. Any thoughts? Thanks, Mike in Arkansas