hi guys, i just registered to help you out with this thread. when you guys have these kinds of questions you may want to check out the FE forum to get more accurate info about these engines. we can't help you with cobra chassis questions (we can but we don't profess accuraccy! LOL). the FE forum is the best place to get accurate info about FE engines and it is where the drill bit test came from (courtesy of Dave Shoe and his research). the forum is located at:
http://www.network54.com/Hide/Forum/74182 . the block you have is a 390. the C7ME-A is a common number and despite many bad lists out there it can be a 352 360 390 410 428 361 or 391. the casting numbers used on 1966 and later blocks do not denote the engine size unless it is a 427. all of the mid sixties and later blocks do have the 4 bolt mounts on the block. this was a change made for the cars not for the trucks but since the blocks are cast from the same molds the trucks got the newer style mounts even though they did not use them (FT's are mounted from the bellhousing and from the front timing cover not from the sides of the block). note an FT block will have a larger diameter hole inside the block where the bottom of the distributor shaft fits in (you can buy a special bushing from ford to convert the hole to the smaller size which is what ford did on the mid seventies pickups as most of the blocks seem to have the larger hole). FT's also have an
oil drainback hole in the skirt for the compressor which will not be present on an FE block. if your block is a 4.05 bore it is a 360 or 390 and not a 428. if it was a later block it could have thicker walls but a sonic test will be the measurement as the drill bit test is meant to be a guide only as we have found that these particular blocks can be very thin at the top so even if it measure good at the freeze plug hole a sonic will expose thinner areas. also as a couple of side notes the super cobra jet and cobra jet used the same block and there is no difference between them, it is the crank, rods, and pistons that are different, and the reinforced main webs were used on the CJ's but also on many 352 360 and 390's especially in the 62-65 and the 72-76 time frames. as a final unrelated note, just because it may say 66 427 on the back of the block does not make it a 427. the rear bulkhead mold was used on any size engine and you can have any size engine marked with this and it is NOT an underbored 427, it is whatever the bore core was, not what the rear bulkhead core was (sorry, it has become a pet peeve to see these on ebay and see get people ripped off!). hawkrod