Ahhh, the 1980's bit explains alot. The cap size, the old looking design and the ancient components from manufacturers that went bust long ago also the lack of PDF documentation

The modern caps should be ok even if they are smaller, but just because the caps on the board are old dont assume they are lesser quality. This was probably an expensive bit of kit when new.

Get it working on the breadboard and then transfer to an etched board if you want to neaten things up.