Many times enlargers in the 5x7 and 8x10 range can accept a number of different heads from various manufacturers. This is also true for 4x5 enlargers to some extent.

If it has the late model Super Chromega II head with working power supply or a Chromegatrol, it is very robust and likely to last a long time. If the Beseler chassis is in good shape, then I don't see anything wrong with that combination. Avoid the older Chromega heads with non-dichroic filters. Can you post a picture?

In some cases the head is the most important part, as chassis without heads have been junked, given away or sold for very little. So, if anything happens to that Beseler chassis, it would probably be pretty easy to find a suitable omega chassis (D2, D3, D4, D5, D6, Prolab) without a head for cheap or even free (in certain parts of the USA).