Found this info online, might help the Volvo guys. Most engines in Glastron IO's can be crossed in parts reference because they are american made engines similar to cars/trucks. Unfortunately I just can't locate where the Volvo engine was used elsewhere, maybe it was? So for parts and gaskets, maybe online is the best choice?
AQ130A: Used with the 100 and 250 series drive, ran 9.5:1 compression ratio and used Stromberg carbs. Rated at 130 hp.
AQ130B: Same as above but ran 8.4:1 compression ratio. Rated at 115 hp.
AQ130C: Used with the 250 and 270 series drive, ran 9.5:1 compression ratio and used Solex 44PA1 carbs. Rated at 130 hp.
AQ130D: Used with the 280 series drive, ran 9.0:1 compression ratio and used Solex 44PA2 carbs. Rated at 130 hp.