Hy Fibonachu, Welcome, firstly I would really appreciate it if you would proof read your post before you post it, it takes me a while to figure things out when words aren't spelled correctly. 348 engines were only available in the larger trucks from the factory and they used a horseshoe front mount and an mount on the front crossmember. If the truck left the factory with a V8 it will have the front engine mounts riveted to the front crossmember, those mounts are not installed on chassis which left the factory with a six cylinder engine. You can purchase a front mount kit from many suppliers that will give you the stock V8 front engine mounts, those coupled with the stock cast iron V8 bellhousing will give you a stable engine mount system. The stock front V8 engine mounts will have to be modified to work with engines with the large diameter harmonic balancer. The front crossmember has all the holes to mount the factory V8 engine mounts, hope that helps.
