I have a 67 conv. (I think the date code on body tag is 05C) that the previous owner said had a 68 350 in it. I recently got the 67-69 restoration book and I think the motor may be a 326. The casting # is 9786339, heads are 140, date code is d287. The block is a YJ and there is a no. stamped close by that reads 595511. I didn't find a verticle no. near the timing chain cover. It had a 68 4-barrel intake on it #9794284. Is this the correct motor for my car (vin# 223677u142693).