>>Hi, i'm new to this board
Welcome to the forums!
I recently replaced the drive train in my 67 with a 302-based motor and an AOD trans. Click this link
to see all of the gory details.
>>what i wanted to know was what flexplate should i use ?
You will need a 164-tooth, 28 oz flexplate since you have an early 302 motor.
>>Will my starter off the '68 work with the flexplate off the '88 thunderbird ?
Your starter from the 68 will work, provided that you have a blockplate. The blockplate properly indexes the starter to the flexplate.
However, you will not be able to use the flexplate from the T-bird. Reason being that its motor was using a 50-oz flexplate where you need a flexplate that is 28 oz.
>>There is a flexplate on the engine now - will that one work ?
Sadly, no. While the flexplate on your 68 IS 28 oz, it has only 157 teeth. That is about 7 teeth short of what you need. 8)
is another link to an article written by a guy who did this swap into a 1971
Mustang convertible. Not quite apples to apples, but should provide you with many an insight into your future endeavor.
Oh, almost forgot: you're also going to need a crossmember. You can get one here: