70 yr. old retired car nut. Wanted a 65-70 mustang fastback but a little too pricey. Found a 1977 mustang ll coupe at the junkyard and restoration is going along nicely trying to find a 302 to rebuild pretty much to stock specs. Found a 1970 351 W 4v with holley 4 barrell carb. not a trace of smog gear? Did it come from the factory that way ??? I know it's too big for the mustang. I would like to get some info particularly on the 4v heads. Don,t know if this would be a good motor to grab or not for some other project !