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back in the day, toyota knew about the problem and would replace the manifold for free. in the 22r they redesigned the shield and the cracking stopped
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Toyota 20R engines are famous for cracked exhaust manifold ( usually between #2 and #3 exhaust ports).
I realize yours is a 22R, but the same issues occurred with that block too.
Turns out the heat shield is the culprit. The excess heat generated by the hot exhaust gets trapped underneath the shield. With no way to dissipate, it ends up cracking the cast iron header.
Unless you feel you absolutely need that heat shield, I’d delete it completely.
Not to be a doomsayer, but the cracked manifold is often mistaken for a leaky exhaust gasket.
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my dolphin came to me with the weber. i have used this carb many times on datsun 510's and 620 pick ups.
easy to install. the air filter adapter is a must if you need it to smog, but the standard oblong k&n type works better
look on ebay as they come up occasionally
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