So, I just bought a 543...

33IMP said

I am a firm believer in running what you have, rather than wait, or spend big money to try to get "right". I wouldnt bother to change e-streets for rpm, they are the same head. Either is "too small" for a 543. Will it keep it from running hard? Nope. Will it be better with tf 270s? Yep. Can you have fun with it for months if you run it with e streets while it waiting for 270s? You tell me.

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Your thought process is similar to mine in this situation. I can always get the TF 270 heads and an intake later when things are more readily available. Can I have fun with it the way it is as long as it runs? I can have fun cruising around in my /6 Duster, so yeah, I can.

When I was talking to the Edelbrock tech, he said if I have the RPM heads, he would suggest swapping the springs into them and using them onto this engine. Something about the E-Street hardware isn’t meant to take the beating of a roller cam or something like that. I had a lot of background noise when he was explaining it.