Just to add another note in regards to your first question about engine options. All the early inline GMC engines (228, 236, 248, 256, 270 and 302) will bolt directly into your truck. This leaves you with lots of options.......


"The Operation of GMC trucks is normally smooth and steady, with no loud rattling, knocking or unusual noises. A good driver will quickly become accustomed to driving a GMC truck and will get the feel of his vehicle regardless of his engineering knowledge."-TM10-1563