[Healeys] connecting rod bolts

[john spaur]

I am working on the engine and have realized that the connecting rod 
bolts might be the original ones. I have read that they can stretch 
and should be replaced. However, it does not appear that they are 
available for a 1962 engine. I noticed that the Moss catalog lists 
ones for a BJ7 and BJ8 with the difference between those and the BT7 
engine being the length of the locking pin.

Should I consider replacing the bolts (very expensive)?

Thank you,
John