I have never had the pan off, dont know if its a 4bolt. My guess would be no. The oil pan leaks front and rear. Rear leak might be the main seal but has leaked slow for all 5 years, just enough to keep bottom of pan wet. I will ship at your expense. I pulled the 350 after finding a good deal on tbi454. It lived in my k5 mud truck for 4 years, very dirty outside, very clean inside. I changed oil every 3k or 5 months. Was run with rev limiter @4500. Rarely hit 4500k. Also run with exhaust leak last 1.5 years. Smogged extremely clean. No nocks. Never fouled a plug. I have not serviced it once while I have had it. I put 10k on it over about 5 years, it came with the k5. It comes with all accessories and brakets, assembled(minus starter). Never burned oil, no smoke at startup. Thats about all I can think of.
Charlo