I'd bet you make over 1000hp, mine was what id call a pump gas friendly 582 converted to alky and it made 965 without the vac pump. This winter I changed compression, rod combo and bet it makes 1000.
Yours with 15:1 comp, the rfd heads, with the right cam with a terminator should go 1050. Mine weighs 1965lbs with me in it 965hp went 4.75@146, the year before as a hardtail same combo it went 4.67@148. Converter is key to get them to ET.
