I am converting my C4 to a toploader 4 speed this weekend. I need to know what the purpose of the bellhousing to engine block spacer plate is and whether the one for the 157 tooth will work for a 164 tooth flywheels on a 302. I have the larger flywheel and bellhousing. The only plate I can find is listed at the 157 tooth version and it is on back order. Do I really need it? Will the one listed for the 157 tooth flywheel work, because I can't find one that is for the 164 tooth. Thanks.