360 casting # question

I have a 360 with a casting # I haven't seen any help would be appreciated. The block is date coded 6-25-70, casting # 3418496-7-360 is this a desireable or not so desireable block. I have a 68 barracuda convertible with this engine in it and am debating to go ahead and rebuild this engine , possibly stroke it, or try to find the correct 340 for the car. Any thoughts are appreciated
Author: admin