My friend has a 78/79 eltigre cross country, that he bought not running. He did a swap job and in pay got a chassis and engine from a 91 cat. The 91 cat's 440 has a hole through a piston. We have checked on a couple of aftermarket pistons sites and it seems that the pistons from the eltigre should fit into the 91 440. Does this work? Or has anybody put a 90's 440 into a 78/79 eltigre?