Help

[STORMY2ALLEN]

Hello everyone I have an 1986 Ebbtide Rivera with an 3.8 v6 in it. Well the reason I need help is that when i bought it it had a craked block in it. So I had it replaced and when the mechanic got the new engine in he relized that the orignal manifolds were cracked he tried to have them welded but they just craked more. Does anyone know where I might be able to aquire a set or know of a true aftermarket bolt on set.

Thanks