I've been tryna find a replacement intake manifold for my 85 LT250EF because it's all hardened up but i can't seem to find one. Are there any other manifolds that would fit this model. Or how should i soften this manifold. I saw that wintergreen oil would help to soften it up but i wouldn't know how long it would last. Any other tips on how to get a tight seal around the engine intake would be appreciated.