guy in wildomar ca by temecula has a nice 454 dual carb tunnelram ,mag, nicely built big pan to carb with headers he paid 3500 he told me he would sell it for 2500
still on the engine stand from when he got it...........
I know of a great Gen4 454 for sale. It was built by the same builder that built my motor, a very reputable boat motor builder. It's never been fired since it was built, it's sitting on the stand in his shop in Southern Cal. He needs to get $3500 for it though. Depending on intake and exhaust set up the motor is capable of 400-500 HP, not a race motor but a very reliable well built piece. It's fully blue-printed and balanced and ready to go!
If you're interested shoot me a PM and we can talk more about it.
If your looking for a compleate replacement, I've got a buddy thats got a mercrusier 454/330hp. It's bone stock and has around 400hrs on it but runs great and doesn't burn/use any oil. Not sure exactly what your interested in as far as performace but if you want I could put in a call for you. This motor is complete from carb to pan and I believe comes with stock exhaust as well. I think he was asking $1,800 but am sure he is negotiable on that price.