I am trying to decide if I want to keep the original 351W in my 1979 thunderbird or replace it with a 460.. My original 351W has 135 horse stock.. I have changed the intake and carb. The 460 has 205 horse stock. I have changed the 351W intake and carb. and spent a decent amount of cash doing so.. But I have to change the rear main seal and the heads to 4 barrel heads, cost aprox. $600. Or I can purchase the 460 for around the same cost. Any suggestions.
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