magnum flexplate question (running out of questions I swear!)
b&m makes one...and mopar makes one..
as far as a stock 318/340 flexplate yes they are for internallly balanced engines....but
what converter are you running?....
they are for the 5/16 thread bolt holes....performance/racing converters use 7/16 bolt holes...
looks like this one fits all....internally balanced..
http://cgi.ebay.com/ebaymotors/Mopa...ptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories