Those speakers are rated 86dB and 87dB respectively, but both are 4 ohms, so that's 83dB/84dB at 1 watt. You are going to want around 60 watts for fully satisfactory performance, about 10 times what 300B/2A3 SET amps can produce.
You can get quite nice sound for casual listening, or under particular conditions of room size, specific music, etc., but if you are a typical audiophile the limitations will always bug you with an SET. At least, that was my experience when I had such a system, many years ago.
Neither manufacturer provides information on the speaker's impedance as a function of frequency, so it's hard to say how "difficult" a load they may be.