No problem at all... I'm not very familiar with the engine so your information is helpful.The 1GGTE 6 cylinder is a toyota 2 litre engine loosely based or similar to a shrunk version of the 7MGTE. It has a 75mm bore and stroke and came factory in early model supra's and soarers. It also came in turbo, supercharged and NA versions.
If you are chasing a head gasket, the only 2 options are genuine toyota which is fine if you O ring the block, or a HKS gasket. The HKS ones would have to be special ordered as I doubt anyone in america would have them. As a little bit of info for you, a set of 2JZ main studs fits nicely as head studs and main studs as well.
Sorry for the thread hijack. just trying to help your customers, I own the worlds fastest 1G with a [email protected] in street car with 8.5" slicks. You'll find more information on this engine on the australian toyota forums such as www.toymods.net