Poly 318 heat riser / cold starts?

["Gary H." <62to65mopar@xxxxxxxxxxx>]

1970 LA 318 engines had a system of heat riser, choke, heated air intake including the heat stove and air cleaner to allow quick starting in cold temperatures and to prevent carb icing.

What about the '62-'65 Poly? It a simpler approach with a choke and exhaust manifold heat riser. By now the exhaust manifold heat riser spring has probably deteriorated or broke and the valve rusted stuck.  Heat Riser Repair Kits are over $200 for NOS.

Any tips about an aftermarket or DIY substitute for the exhaust manifold heat riser?

Thanks,
Gary H. 

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